A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash.nlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic explosive eruptions and effusive eruptions, although some have collapsed craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity.
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S waves, or secondary waves, are the waves directly following the P waves. S waves travel in the same direction, but instead of being a compressive wave, they oscillate with a shearing behavior at right angles to the direction of motion. Figure 1B shows that though the wave direction is the same as the P wave, the ground motion moves the house side to side.